export v2: Remove hardcoding of "strain" as the metadata ID column #1523

Job	Run time
test (python=3.7 biopython=1.73)	9m 24s
test (python=3.7 biopython=1.76)	9m 16s
test (python=3.7 biopython=1.79)	11m 22s
test (python=3.7 biopython=latest)	12m 45s
test (python=3.8 biopython=1.76)	10m 1s
test (python=3.8 biopython=1.79)	13m 47s
test (python=3.8 biopython=1.80)	12m 0s
test (python=3.8 biopython=latest)	11m 58s
test (python=3.9 biopython=1.79)	12m 57s
test (python=3.9 biopython=1.80)	9m 55s
test (python=3.9 biopython=latest)	10m 14s
test (python=3.10 biopython=1.80)	11m 49s
test (python=3.10 biopython=latest)	10m 6s
test (python=3.11 biopython=1.80)	12m 17s
test (python=3.11 biopython=latest)	9m 57s
test-pathogen-repo-ci (avian-flu)	1m 17s
test-pathogen-repo-ci (ebola)	1m 5s
test-pathogen-repo-ci (lassa)	1m 7s
test-pathogen-repo-ci (monkeypox)	2m 17s
test-pathogen-repo-ci (mumps)	1m 33s
test-pathogen-repo-ci (ncov)	1m 29s
test-pathogen-repo-ci (seasonal-flu)	1m 31s
test-pathogen-repo-ci (zika)	1m 10s
build-docs / build-conda	0s
build-docs / build-pip	1m 31s
codecov	18s
	3h 1m 6s

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